Q: Which of the following is the correct formula for molarity?

$$M = \frac{\text{moles of solute}}{\text{volume of solution (L)}}$$

Question 1

Which of the following best describes a precipitation reaction?

Accepted Answer

A reaction in which a solid, insoluble product forms and separates from the solution.

Question 2

What is the correct balanced chemical equation for the combustion of methane?

Accepted Answer

$$\mathrm{CH_4$(g) + 2O_2(g) \rightarrow CO_2$(g) + 2H_2O(g)}$$

Question 3

Which compound is insoluble in water according to the solubility rules?

Accepted Answer

AgCl

Question 4

When baking powder is used in cake recipes, which gas is produced that causes the cake to rise?

Accepted Answer

Carbon dioxide

Question 5

What is the oxidation state of chromium in $$\mathrm{Cr_2O_7$$^{2-}$$}$$?

Accepted Answer

+6

Question 6

Which of the following is a strong electrolyte?

Accepted Answer

NaCl

Question 7

A solution is prepared by dissolving 0.255 mol of NaOH in water to make 2.04 L of solution. What is the molarity of the solution?

Accepted Answer

$$0.125\ \mathrm{mol\ L$$^{-1}$$}$$

Question 8

Which of the following is the net ionic equation for the reaction between Pb(NO$$_3$$)$$_2(aq) $$and KI(aq)?

Accepted Answer

$$\mathrm{Pb$$^{2+}$$(aq) + 2I^-(aq) \rightarrow $$PbI_2$$(s)}$$

Question 9

How many moles of NaCl are present in 2.0 L of a 0.5 M NaCl solution?

Accepted Answer

$$1.0\ \mathrm{mol}$$

Question 10

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$$\mathrm{\%\ yield = \frac{actual\ yield}{theoretical\ yield} 	imes 100\%}$$

Question 11

In the reaction $$\mathrm{2Mg(s) + O_2$(g) \rightarrow 2MgO(s)}$$, if you start with 42.5 g of Mg and 33.8 g of O$$_2$$, what is the limiting reactant?

Accepted Answer

Mg

Question 12

Which of the following best describes an oxidation-reduction (redox) reaction?

Accepted Answer

A reaction in which electrons are transferred between reactants.

Question 13

What is the molarity of a solution prepared by diluting 0.150 L of a 10.0 M CaCl$$_2$$ stock solution to a final volume of 3.00 L?

Accepted Answer

$$0.500\ \mathrm{mol\ L$$^{-1}$$}$$

Question 14

Which of the following is a weak acid?

Accepted Answer

CH$$_3$$COOH

Question 15

What is the net ionic equation for the neutralization of HCl(aq) with NaOH(aq)?

Accepted Answer

$$\mathrm{H^+(aq) + OH^-(aq) \rightarrow H_2O(l)}$$

Question 16

If 0.108 mol of Na$$_2CO$_3$$ reacts with HNO$$_3$$ according to $$\mathrm{Na_2CO_3(aq) + 2HNO_3(aq) \rightarrow 2NaNO_3(aq) + CO_2$(g) + H_2O(l)}$$, how many moles of HNO$$_3$$ are required?

Accepted Answer

$$0.216\ \mathrm{mol}$$

Question 17

Which of the following is the correct oxidation state for oxygen in most compounds?

Accepted Answer

-2

Question 18

In the redox reaction $$\mathrm{Mn$$^{2+}$$(aq) \rightarrow $$MnO_4$$^-(aq)}$$, what happens to the oxidation state of manganese?

Accepted Answer

It increases from +2 to +7.

Question 19

Which of the following is the correct formula for molarity?

Accepted Answer

$$M = \frac{	ext{moles of solute}}{	ext{volume of solution (L)}}$$

Chemical Reactions and Stoichiometry: Study Notes for CHY 102

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